Today while I was out shooting at a local skate park, I was really trying to utilize the cameras tracking, but it was just not as accurate as I would have liked. I know the AF system is reinforced by Nikon's scene recognition system, but I think the Multi-Cam 1000 AF module might be slower or less accurate then I had originally thought. An example of what I was doing, I was tracking a dude on a BMX and panning with him as he approached various obstacles, the closer he got, the faster the action (I was shooting in 3D tracking). Now, I allowed the camera to SEE him and tried to get it to lock on, but the focus points would usually go sporadic, picking various objects around him. He was filling approx 60-70% of the frame, and his "color" was vastly different from the backgrounds. I then went into Dynamic mode and had a bit better luck, but nothing really stellar. I also would liked to have had the ability to move up to 1/8000, but whatever. I'm really looking for feedback from folks with the D700 and D300s on this one. Lets say you are in Dynamic mode and you place your focal point on a subjects face, will the camera then lock on, and stay on the subject even with movement? With that "51 Group Dynamic with 3D Focus Tracking", if you point at let's say a person riding a bike right past you, will it stay locked as you pan with it? Is it as accurate with the subject filling a smaller portion of the frame?